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Due to an increase in power demand, different direct AC-AC conversion structures were developed. Classical direct converters present the disadvantage of a high harmonic content and the consumption of reactive power. For these reasons, different classes of PWM AC choppers were developed during the last decade. Of these solutions, two-level and four-level PWM AC choppers are presented. Multilevel converters...
This paper presents a comparative study between three five-level converters. Control strategies and simulation results are presented in order to show the principles that led to the development of these converters. Advantages and disadvantages are presented in view of the total harmonic distortion factor, the number of semiconductor devices and flying capacitors and the energy stored in the flying...
The paper proposes to analyze a real case study from Galati town power delivery system. The study will consider a technical solution to save power losses using an adequate harmonics filter together with a reactive power correction system. The solution conducts calculations with the objective to minimize the total power losses. On this purpose we use an important data base obtained by local power delivery...
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